APA (7th ed.) Zitazioa

Gaskell, P. (1972). A New introduction to bibliography. Clarendon Pr.

Chicago Style (17th ed.) Zitazioa

Gaskell, Philip. A New Introduction to Bibliography. Oxford: Clarendon Pr, 1972.

MLA (9th ed.) Zitazioa

Gaskell, Philip. A New Introduction to Bibliography. Clarendon Pr, 1972.